Add One To Number - The Coding Shala

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Add One To Number InterviewBit Solution

Given a non-negative number represented as an array of digits, add 1 to the number ( increment the number represented by the digits ).
The digits are stored such that the most significant digit is at the head of the list.
Example:
If the vector has [1, 2, 3] the returned vector should be [1, 2, 4]
as 123 + 1 = 124.
Add One to Number Java Program - The Coding Shala

Solution:

Here first we need to remove leading zeros from the given vector then add 1 to vector.

Java Code::

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public class Solution {
    public ArrayList<Integer> plusOne(ArrayList<Integer> A) {
        int i=0;
        while(i<= A.size()-1 && A.get(i)==0) A.remove(i);
       // for(int i=0;i<A.size();i++) System.out.print(A.get(i)+" ");
        int carry = 1;
        for(i=A.size()-1;i>=0;i--){
            int tmp = A.get(i)+carry;
            if(tmp>9){
                A.set(i,tmp%10);
                carry = 1;
            }else{
                A.set(i,tmp);
                carry = 0;
                break;
            }
        }
        if(carry > 0) A.add(0,carry);
        return A;
    }
}



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